Electromagnetic instrument.



No. 637,778.- Y' Patented Nov. 28, |899.

G. E. L. GRABE.

ELECTRUMAGNETIC INSTRUMENT.

(Application led Aug. 4, 1899.)

(No Model.)

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UNITED STATES PATENT OFFICE.

GEORG EUGEN LEOPOLD GRABE, OF BERLIN, GERMANY, ASSIGNOR TO THE SIEMENS t HALSKE ELECTRIC COMPANY OF AMERICA, OF CHICAGO,

ILLINOIS.

ELECTROMAGNETIC INSTRUMENT.

SPECIFICATION forming part of Letters Patent No. 637,778, dated November 28, 1899.

, Application iiled August 4, 1899.

To all whom, it may concern: l Be it known that l, GEORG EUGEN LEOPOLD GRABE, engineer, a subject of the German Emperor, residing at Berlin, Kingdom of Prussia, Germany, have invented a certain new and useful Improvement in Electromagnetic Instruments, (Case No. 217,) of which the following is a full, clear, concise, and exact description, reference being had to the lo accompanying drawings, forming a part of this specification.

My invention relates to alarm-bells, buzzers, and other electromagnetic instruments employing vibrating armatures, and espe- I5 cially to those instruments in which the armature is used to change the condition of the circuit employed for eect-ing the operation of the electromagnet.

The invention has for its object the im- -provement in the construction of that class of electrical instruments whose operating parts are inclosed by weatherproof casings, the object of my invention being greatly to simplify the construction and to provide a more 2 5 compact arrangement of the operating parts.

Generally speaking, my invention may be described as consisting of a casing for the instrument, a diaphragm of extended area forming a wall or a portion of a lwall of the casing,

3o a hammer carried, preferably, by said diaphragm upon the exterior of the casing, an armature also carried by the diaphragm and disposed, preferably, Within the casing, in which is also placed the electromagnet, and

3 5 a circuit-changing portion Within the casing and having-one member carried by the diaphragm. The diaphragm is constructed of resilient flexible material, so that it may enable the armature to vibrate.

I will explain my invention more particularly byreference to the accompanying drawings, in which-- Figure 1 is an elevation of a vibrating bell constituting one embodiment of the invention. Fig. 2 is a cross-sectional view on line 2 2 of Fig. 1, illustrating also the circuit connections of the apparatus.

Like letters indicate like parts in both tigures.

A receptacle a is provided with a cover b,

Serial No. 726,153. (No model.)

having a diaphragm c of resilient iexible material. The casing comprising the receptacle a, the cover b, and the diaphragm c forms a water-tight or Weatherproof inclosure for operating parts, as will be hereinafter more fully explained. A vibrating or buzzing member d is preferably provided upon the exterior of the casing, a gong e being in this instance mounted upon the exterior of the casing, against which the hammer carried by the vibrating member is adapted to strike.

Within the casing is mounted an electromagnet j', whose cores are preferably perpendicularly disposed with relation to the diaphragm c, the poles of the electromagnet opposing the said diaphragm. I preferably provide an armature g for the electromagnet, which is preferably also inclosed within the casing, the said armature being secured to the diaphragm. I provide a leaf-spring h, which cooperates with the diaphragm to remove the armature from the opposed poles of the magnet, a set-screw e' being provided for adjusting the tension of the spring. The spring is preferably provided with an extension supporting a contact-anvil lo, opposed to a second contact-anvil Z, these contact-anvils forming terminals of a circuit including the spring h, the set-screw c, a battery on, and the electromagnet f.

It will be observed that the conductor forming a part of the circuit is passed through a wall of the receptacle d. The parts are so adjusted that when the circuit is closed by a push-button or other switch p contact between the terminals k and Vl is rapidly made and broken. The contact parts 7c and Z by being thus inclosed are free from the deleterious influence of moisture, tre.

WhileI have shown an electric bell that is operated by alternately making and breaking a circuit, other circuits may be employed.

I do not wish to be limited to the precise construction shown; but,

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In an instrument of the class described, the combination with an electromagnet, of a closed casing for containing the same, a diaphragm ofA yielding material forming apart of the said casing, an armature for the saidthe combination withithe closed, casing, a.

yielding-diaphragm forming a pa-rt thereof; of an electromagnet, circuit-changing means for controlling the circuit including the elec- 4 tromagnet included within the' said casing,` an armature for the electromagnet carried by y the said diaphragm and a vibrating member d carried by the diaphragm, substantiallyl as` described.

3. In an instrument of the class described,

the combination with two parts comprising. an electromagnet and its armature, of an in-` closed casing, a yield-ing diaphragm form-ingI a lpartvof the said casing, oneof theY aforesaid two parts bein-g carried by the said diaphragm', a circuit-changing portion for controlling the circuit including theelectromagnet con-tai ned withinthe inclosed casing anda Vibrating member d carried by the diaphragm, sub'- s'tantially as described. Y

' 4. In' an instrument of the class described,

the combination-with an electromagnet of.. a

closed casing for containing the sam-e, a diaphragm of yielding material forming part-of said cas-ing, an armature for the said magnet carried by the said 'diaphragm anda vibratory member CZ carried by the diaphragm upon the exterior ofthe casing, the arlnaturecbe.- ing also contained withinthe casing, substantially as described.

5. In aninstrurnent-of the classdescri-bed', the combination with an electromagnet, of a closed ycasing for4 containing the same, a'diaphragm of yieldin-g material form-ing apart vof the said'casing, an armature for the' said magnet carriedby the said' diaphragm, the@f armature being also contained within theL said"casi;ng and a spring hwithinthe casingl for removing the armature from the electromagnet; substantially as described.

6. In an instrument of theclass described, the combi-nation with an electromagnenofa closedi c'asing'for containing the same,.a dia phrag-m of yielding material formi/ng, a part of the saidcasing, an armature for the said l magnet vcarried by the said diaphragm, and* a buzzing member d also'carried by said diaphragm, substantially4 as described.

l7. Inan instrument of thel class described,`

the combination with an electrom'agnet, cfa

closed casing for containing the same, a dia` phragm of yielding material forming-a part ofthe saidfcasing, an armature for the Said magnet carried by thesaid diaphragm, a buzzing member d also carried by said diaphragm, and aspring h for eifecting the removal of the armature from the electromagnet, substantially as described.

8; In 'auv instrumentof 'the class described, the combination with a closed casing; of an electromagnet ywith its armature contained withinthesaid casing,a diaphragm forming r a part of the said casing, upon which the said armature is mounted, a contact k carried by the armature,l and a second contact l opposed to the contactxk, the. said contacts forming terminals of a circuit including the electromagnet and being `inclosed within thev said casing, vsubstantially as. describedxiY 9; In an instrumentof the class described,-- the-combination with a` closed casing, ofian el'ectromagnet with its. armature contained Within the saidfcasi`ng,va diaphragm'forming a part of the. said casing, upon whichthe said armature is: mounted, a contact la' carriedby' thearmatu-re, a second contact [opposed to the contact k, the said contacts forming'tenA mi'nalsof a circuit including theelectromagf' net and being inclosed within the said casing, and a buzzerd also carried by the said diaphragm, substantially as described.

10; In an instrument ofthe class described, thecombination with a closed casing, of an electromagnet with itsarmature contained Within the said casing, a diaphragm forming a part of the said casing, upon which the said armature is mounted,`a contactt carried by the armature, a second contact Z opposed. to. the contact la, the said contacts Vforming terminals of a circuit including'the electromagnet andV being inclosed within the said `casing a buzzer d also carried bythe said diaphragm, andC a springih' for` effecting'V the removalof the armature, substantially as described. lll. Inan instrument ofthe class described, the combination with a closed casing, a vibrain'g diaphragml forming apart thereof, of a buzzing element d' carried by the said diaphragm, `and means for cntrolling the ope-ration ofthe said element d located within the casing, substantially as described.

.In witness whereofI hereunto subscribe my name this 8th day of July, AJ). 1899.

` GEORG EUGEN 'LEOPOLD IGRABE.`

Witnesses:

WOLDEMAR HAUPT, HENRY HAsPER. 

